lib/hdb/ndbm.c

   1 /*
   2  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "hdb_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 #if HAVE_NDBM
  39
  40 #if defined(HAVE_GDBM_NDBM_H)
  41 #include <gdbm/ndbm.h>
  42 #elif defined(HAVE_NDBM_H)
  43 #include <ndbm.h>
  44 #elif defined(HAVE_DBM_H)
  45 #include <dbm.h>
  46 #endif
  47
  48 struct ndbm_db {
  49     DBM *db;
  50     int lock_fd;
  51 };
  52
  53 static krb5_error_code
  54 NDBM_destroy(krb5_context context, HDB *db)
  55 {
  56     krb5_error_code ret;
  57
  58     ret = hdb_clear_master_key (context, db);
  59     free(db->hdb_name);
  60     free(db);
  61     return 0;
  62 }
  63
  64 static krb5_error_code
  65 NDBM_lock(krb5_context context, HDB *db, int operation)
  66 {
  67     struct ndbm_db *d = db->hdb_db;
  68     return hdb_lock(d->lock_fd, operation);
  69 }
  70
  71 static krb5_error_code
  72 NDBM_unlock(krb5_context context, HDB *db)
  73 {
  74     struct ndbm_db *d = db->hdb_db;
  75     return hdb_unlock(d->lock_fd);
  76 }
  77
  78 static krb5_error_code
  79 NDBM_seq(krb5_context context, HDB *db,
  80          unsigned flags, hdb_entry *entry, int first)
  81
  82 {
  83     struct ndbm_db *d = (struct ndbm_db *)db->hdb_db;
  84     datum key, value;
  85     krb5_data key_data, data;
  86     krb5_error_code ret = 0;
  87
  88     if(first)
  89         key = dbm_firstkey(d->db);
  90     else
  91         key = dbm_nextkey(d->db);
  92     if(key.dptr == NULL)
  93         return HDB_ERR_NOENTRY;
  94     key_data.data = key.dptr;
  95     key_data.length = key.dsize;
  96     ret = db->hdb_lock(context, db, HDB_RLOCK);
  97     if(ret) return ret;
  98     value = dbm_fetch(d->db, key);
  99     db->hdb_unlock(context, db);
 100     data.data = value.dptr;
 101     data.length = value.dsize;
 102     if(hdb_value2entry(context, &data, entry))
 103         return NDBM_seq(context, db, flags, entry, 0);
 104     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 105         ret = hdb_unseal_keys (context, db, entry);
 106         if (ret)
 107             hdb_free_entry (context, entry);
 108     }
 109     if (entry->principal == NULL) {
 110         entry->principal = malloc (sizeof(*entry->principal));
 111         if (entry->principal == NULL) {
 112             ret = ENOMEM;
 113             hdb_free_entry (context, entry);
 114             krb5_set_error_string(context, "malloc: out of memory");
 115         } else {
 116             hdb_key2principal (context, &key_data, entry->principal);
 117         }
 118     }
 119     return ret;
 120 }
 121
 122
 123 static krb5_error_code
 124 NDBM_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry *entry)
 125 {
 126     return NDBM_seq(context, db, flags, entry, 1);
 127 }
 128
 129
 130 static krb5_error_code
 131 NDBM_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry *entry)
 132 {
 133     return NDBM_seq(context, db, flags, entry, 0);
 134 }
 135
 136 static krb5_error_code
 137 NDBM_rename(krb5_context context, HDB *db, const char *new_name)
 138 {
 139     /* XXX this function will break */
 140     struct ndbm_db *d = db->hdb_db;
 141
 142     int ret;
 143     char *old_dir, *old_pag, *new_dir, *new_pag;
 144     char *new_lock;
 145     int lock_fd;
 146
 147     /* lock old and new databases */
 148     ret = db->hdb_lock(context, db, HDB_WLOCK);
 149     if(ret)
 150         return ret;
 151     asprintf(&new_lock, "%s.lock", new_name);
 152     if(new_lock == NULL) {
 153         db->hdb_unlock(context, db);
 154         krb5_set_error_string(context, "malloc: out of memory");
 155         return ENOMEM;
 156     }
 157     lock_fd = open(new_lock, O_RDWR | O_CREAT, 0600);
 158     if(lock_fd < 0) {
 159         ret = errno;
 160         db->hdb_unlock(context, db);
 161         krb5_set_error_string(context, "open(%s): %s", new_lock,
 162                               strerror(ret));
 163         free(new_lock);
 164         return ret;
 165     }
 166     free(new_lock);
 167     ret = hdb_lock(lock_fd, HDB_WLOCK);
 168     if(ret) {
 169         db->hdb_unlock(context, db);
 170         close(lock_fd);
 171         return ret;
 172     }
 173
 174     asprintf(&old_dir, "%s.dir", db->hdb_name);
 175     asprintf(&old_pag, "%s.pag", db->hdb_name);
 176     asprintf(&new_dir, "%s.dir", new_name);
 177     asprintf(&new_pag, "%s.pag", new_name);
 178
 179     ret = rename(old_dir, new_dir) || rename(old_pag, new_pag);
 180     free(old_dir);
 181     free(old_pag);
 182     free(new_dir);
 183     free(new_pag);
 184     hdb_unlock(lock_fd);
 185     db->hdb_unlock(context, db);
 186
 187     if(ret) {
 188         ret = errno;
 189         close(lock_fd);
 190         krb5_set_error_string(context, "rename: %s", strerror(ret));
 191         return ret;
 192     }
 193
 194     close(d->lock_fd);
 195     d->lock_fd = lock_fd;
 196
 197     free(db->hdb_name);
 198     db->hdb_name = strdup(new_name);
 199     return 0;
 200 }
 201
 202 static krb5_error_code
 203 NDBM__get(krb5_context context, HDB *db, krb5_data key, krb5_data *reply)
 204 {
 205     struct ndbm_db *d = (struct ndbm_db *)db->hdb_db;
 206     datum k, v;
 207     int code;
 208
 209     k.dptr  = key.data;
 210     k.dsize = key.length;
 211     code = db->hdb_lock(context, db, HDB_RLOCK);
 212     if(code)
 213         return code;
 214     v = dbm_fetch(d->db, k);
 215     db->hdb_unlock(context, db);
 216     if(v.dptr == NULL)
 217         return HDB_ERR_NOENTRY;
 218
 219     krb5_data_copy(reply, v.dptr, v.dsize);
 220     return 0;
 221 }
 222
 223 static krb5_error_code
 224 NDBM__put(krb5_context context, HDB *db, int replace,
 225         krb5_data key, krb5_data value)
 226 {
 227     struct ndbm_db *d = (struct ndbm_db *)db->hdb_db;
 228     datum k, v;
 229     int code;
 230
 231     k.dptr  = key.data;
 232     k.dsize = key.length;
 233     v.dptr  = value.data;
 234     v.dsize = value.length;
 235
 236     code = db->hdb_lock(context, db, HDB_WLOCK);
 237     if(code)
 238         return code;
 239     code = dbm_store(d->db, k, v, replace ? DBM_REPLACE : DBM_INSERT);
 240     db->hdb_unlock(context, db);
 241     if(code == 1)
 242         return HDB_ERR_EXISTS;
 243     if (code < 0)
 244         return code;
 245     return 0;
 246 }
 247
 248 static krb5_error_code
 249 NDBM__del(krb5_context context, HDB *db, krb5_data key)
 250 {
 251     struct ndbm_db *d = (struct ndbm_db *)db->hdb_db;
 252     datum k;
 253     int code;
 254     krb5_error_code ret;
 255
 256     k.dptr = key.data;
 257     k.dsize = key.length;
 258     ret = db->hdb_lock(context, db, HDB_WLOCK);
 259     if(ret) return ret;
 260     code = dbm_delete(d->db, k);
 261     db->hdb_unlock(context, db);
 262     if(code < 0)
 263         return errno;
 264     return 0;
 265 }
 266
 267 static krb5_error_code
 268 NDBM_open(krb5_context context, HDB *db, int flags, mode_t mode)
 269 {
 270     krb5_error_code ret;
 271     struct ndbm_db *d = malloc(sizeof(*d));
 272     char *lock_file;
 273
 274     if(d == NULL) {
 275         krb5_set_error_string(context, "malloc: out of memory");
 276         return ENOMEM;
 277     }
 278     asprintf(&lock_file, "%s.lock", (char*)db->hdb_name);
 279     if(lock_file == NULL) {
 280         free(d);
 281         krb5_set_error_string(context, "malloc: out of memory");
 282         return ENOMEM;
 283     }
 284     d->db = dbm_open((char*)db->hdb_name, flags, mode);
 285     if(d->db == NULL){
 286         ret = errno;
 287         free(d);
 288         free(lock_file);
 289         krb5_set_error_string(context, "dbm_open(%s): %s", db->hdb_name,
 290                               strerror(ret));
 291         return ret;
 292     }
 293     d->lock_fd = open(lock_file, O_RDWR | O_CREAT, 0600);
 294     if(d->lock_fd < 0){
 295         ret = errno;
 296         dbm_close(d->db);
 297         free(d);
 298         krb5_set_error_string(context, "open(%s): %s", lock_file,
 299                               strerror(ret));
 300         free(lock_file);
 301         return ret;
 302     }
 303     free(lock_file);
 304     db->hdb_db = d;
 305     if((flags & O_ACCMODE) == O_RDONLY)
 306         ret = hdb_check_db_format(context, db);
 307     else
 308         ret = hdb_init_db(context, db);
 309     if(ret == HDB_ERR_NOENTRY)
 310         return 0;
 311     return ret;
 312 }
 313
 314 static krb5_error_code
 315 NDBM_close(krb5_context context, HDB *db)
 316 {
 317     struct ndbm_db *d = db->hdb_db;
 318     dbm_close(d->db);
 319     close(d->lock_fd);
 320     free(d);
 321     return 0;
 322 }
 323
 324 krb5_error_code
 325 hdb_ndbm_create(krb5_context context, HDB **db,
 326                 const char *filename)
 327 {
 328     *db = malloc(sizeof(**db));
 329     if (*db == NULL) {
 330         krb5_set_error_string(context, "malloc: out of memory");
 331         return ENOMEM;
 332     }
 333
 334     (*db)->hdb_db = NULL;
 335     (*db)->hdb_name = strdup(filename);
 336     if ((*db)->hdb_name == NULL) {
 337         krb5_set_error_string(context, "malloc: out of memory");
 338         free(*db);
 339         *db = NULL;
 340         return ENOMEM;
 341     }
 342     (*db)->hdb_master_key_set = 0;
 343     (*db)->hdb_openp = 0;
 344     (*db)->hdb_open = NDBM_open;
 345     (*db)->hdb_close = NDBM_close;
 346     (*db)->hdb_fetch = _hdb_fetch;
 347     (*db)->hdb_store = _hdb_store;
 348     (*db)->hdb_remove = _hdb_remove;
 349     (*db)->hdb_firstkey = NDBM_firstkey;
 350     (*db)->hdb_nextkey= NDBM_nextkey;
 351     (*db)->hdb_lock = NDBM_lock;
 352     (*db)->hdb_unlock = NDBM_unlock;
 353     (*db)->hdb_rename = NDBM_rename;
 354     (*db)->hdb__get = NDBM__get;
 355     (*db)->hdb__put = NDBM__put;
 356     (*db)->hdb__del = NDBM__del;
 357     (*db)->hdb_destroy = NDBM_destroy;
 358     return 0;
 359 }
 360
 361 #endif /* HAVE_NDBM */